JP5460837B1 - Wiper arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper arm having a biasing means for generating a pressing force for pressing a wiper blade against a surface to be wiped, the spring can be reduced in size, and can be reduced in thickness and improved in appearance.
In a wiper arm 1 having a biasing mechanism 10 between an arm head 2 and a retainer 3, a biasing mechanism 10 includes a spring 11 and a pair of fulcrum support members 12 disposed on both sides of the spring 11. The intermediate rivet 13 that connects the distal ends 12A of the pair of fulcrum support members 12 and is fixed to the retainer 4, the fulcrum rivet 14 that connects the base ends 12B of the fulcrum support member 12, and the fulcrum in the fulcrum hole 15D. And a lever member 15 rotatably attached to the rivet 14. The base end side hook portion 11 </ b> B of the spring 11 is engaged with the force point hole 15 </ b> E of the lever member 15, and the action point hole 15 </ b> F of the lever member 15 is attached to the arm head 2 via the roller pin 11.
[Selection] Figure 5

Description

  The present invention relates to a wiper arm provided with urging means (tension spring) for generating a force for pressing a wiper blade against a surface to be wiped.

  Generally, a wiper device is composed of a wiper blade that wipes a surface to be wiped such as a glass surface of an automobile, a wiper arm that holds the wiper blade, and a drive means (drive motor) that drives the wiper arm. The wiper arm includes an arm head that is linked to the driving means, and an arm main body that is rotatably connected to the arm head, and the arm main body holds the wiper arm.

  FIG. 10 is a sectional view showing a part of such a conventional wiper arm. As shown in the figure, the wiper arm 101 includes an arm head 102 and a retainer 104 that is rotatably connected to the arm head 102 via a pivot shaft 103. Here, the retainer 104 is a member constituting a part of the arm body.

  A spring 105 that is a tension coil spring is provided between the arm head 102 and the retainer 104. The front end side hook portion 105 </ b> A of the spring 105 is attached to the retainer 104 via a fixing pin 106. On the other hand, the proximal end side hook portion 105 </ b> B of the spring 105 is attached to the arm head 102 via a hook member 107 and a fixing pin 108.

  With such a configuration, the spring 105 functions to apply a biasing force to the rotation operation of the retainer 104 with respect to the arm head 102. Specifically, as shown in FIG. 10, when the wiper arm 101 is in a normal use state (the retainer 104 is disposed at a position extending almost straight from the arm head 102), the spring 105 is moved to the retainer 104. In contrast, a force for rotating in the counterclockwise direction of rotation in FIG. Thereby, the wiper blade (not shown) held by the arm body is pressed against the surface to be wiped (not shown) with an appropriate pressing force. On the other hand, when the wiper arm 101 is in a locked-back state (the retainer 104 is raised with respect to the arm head 102 in the clockwise rotation direction in the figure), the spring 105 rotates the retainer 104 in the clockwise direction in the figure. The retainer 104 is held in an upright state by being biased in the direction.

JP 2009-045771 A JP 2008-56051 A

  Thus, the wiper arm 101 generates a pressing force that presses the wiper blade against the surface to be wiped by the spring force of the spring 105. Therefore, in order to obtain a sufficient pressing force, the spring 105 needs to generate a strong spring force corresponding to that, and as a result, it is necessary to use a spring having a certain size (diameter) or more. is there. For this reason, in order to arrange | position the spring 105, the big space was needed and there existed a problem that the thickness of the wiper arm 101 was increased by that much.

  Further, the wiper arm 101 requires a hook member 107 for connecting the spring 105 and the wiper arm 102, and the hook member 107 protrudes from the lower side of the wiper arm 101, deteriorating the beauty of the wiper arm 101. There was also a problem of end.

  The present invention was made paying attention to such a problem, and in the wiper arm provided with the urging means for generating the pressing force for pressing the wiper blade against the surface to be wiped, the spring can be reduced in size. An object of the present invention is to provide a wiper arm that can be thinned and improved in appearance.

  The present invention relates to a wiper comprising: an arm head; an arm main body connected to the arm head so as to be rotatable about a pivot axis; and a biasing means provided between the arm head and the arm main body. In the arm, the biasing means includes a spring, a fulcrum support member arranged in parallel with the spring, and a lever member having a fulcrum, a force point, and an action point, and the first end of the fulcrum support member is The lever is linked to the first end of the spring and linked to one of the arm head and the arm body, and the fulcrum of the lever member is linked to the second end of the fulcrum support member. The action point is linked to the other of the arm head and the arm body, and the force point of the lever member is linked to the second end of the spring.

  The urging unit may include a pair of fulcrum support members disposed on both sides of the spring.

  A first connecting member that connects the first ends of the pair of fulcrum support members; and a second connecting member that connects the second ends of the pair of fulcrum support members; Is attached to one of the arm head and the arm body, the first end of the spring is attached to the first connecting member, and the lever member is attached to the second connecting member. And it may be attached to be rotatable around the fulcrum.

  The first and second connecting members may be rivets.

  You may provide the roller pin which connects the action point of the said lever member, and the other of the said arm head and the said arm main body.

  The second end portion of the spring is a hook portion that is attached to the force point of the lever member, and the hook portion is formed so as to be substantially parallel to the upper surface of the arm body. Also good.

  According to the present invention, an arm head (for example, the arm head 2) and an arm main body (for example, the retainer 4 and the arm head 5) rotatably connected to the arm head via a pivot shaft (for example, the pivot shaft 3). And a wiper arm (for example, the wiper arm 1 or 6) provided with an urging means (for example, the urging mechanism 10) provided between the arm head and the arm main body, the urging mechanism 10 is provided with a spring (for example, the spring 11). 21), a fulcrum support member (for example, the fulcrum support member 12 or 22) arranged in parallel with the spring, and a lever member (for example, the lever member 15 or 25), and a first end (for example, a tip) of the fulcrum support member The portion 12A or the base end portion 22B) is linked to the first end portion of the spring (for example, the front end side hook portion 11A or the base end portion 21B) and the arm. The fulcrum of the lever member (for example, the fulcrum hole 15D or 25D) is linked to the second end (for example, the base end portion 12B or the distal end portion 22A) of the fulcrum support member. The point (for example, the action point hole 15F or 25F) is linked to the other of the arm head and the arm body, and the force point (for example, the force point hole 15E or 25E) of the lever member is connected to the second end portion (for example, the proximal side hook portion 11B or The spring force of the spring is amplified (boosted) by the lever member according to the principle of the lever and acts on the rotation of the arm main body with respect to the arm head. . Therefore, even with a spring having a small spring force, a sufficiently large pressing force (a force for pressing the wiper blade held by the arm body against the surface to be wiped) can be obtained. Therefore, the spring can be reduced in size (reduced in diameter). it can. Moreover, the hook member in the conventional wiper arm becomes unnecessary. Therefore, the accommodation space of the urging means (spring) in the wiper arm is reduced, and as a result, the wiper arm can be made thinner.

  Also, a pair of fulcrum support members are provided on both sides of the spring, the first end of the fulcrum support member is connected by a first connecting member (for example, the intermediate rivet 13 or the base end side rivet 24), and the second end of the fulcrum support member. Are connected by a second connecting member (for example, fulcrum rivet 14 or 23), the first end of the spring is attached to the first connecting member, and the insulator member is attached to the second connecting member at the fulcrum. The urging mechanism can be configured as a unit having a rigid structure. Therefore, since the fulcrum of the lever member is reliably supported by the fulcrum support member, it is possible to appropriately boost and transmit the force by the lever member. Further, since the urging mechanism, which is a unit, can be easily attached to the arm head and the arm body, the assembly work of the wiper arm can be made efficient.

  Further, the second end of the spring is a hook part (for example, the base end side hook part 11B or the front end side hook part 11A) attached to the force point of the lever member, and the hook part is the upper surface (for example, the retainer 4). If the spring is formed so as to be substantially parallel to the upper surface 4A), the spring can be disposed at a position close to the upper surface of the arm body, and the wiper arm can be further thinned.

It is a side view showing the whole wiper arm composition in a 1st embodiment of the present invention, and shows the wiper arm in a normal use state. It is a sectional side view which similarly shows the whole structure of a wiper arm, and shows the wiper arm in a normal use state. It is a side view which similarly shows the whole structure of a wiper arm, and shows the wiper arm in a lockback state. It is a sectional side view which similarly shows the whole structure of a wiper arm, and shows the wiper arm in a lockback state. Similarly, it is a partial side sectional view of the wiper arm, and shows the wiper arm in a normal use state. It is a partial sectional side view of a wiper arm, and shows the wiper arm in a lockback state. It is a perspective view which similarly shows an urging mechanism. It is a disassembled perspective view which similarly shows a biasing mechanism. It is a partial sectional side view of the wiper arm in the 2nd Embodiment of this invention. It is a partial sectional side view which shows the conventional wiper arm.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 3 show the overall configuration of the wiper arm 1 according to the first embodiment of the present invention. As shown in the figure, the wiper arm 1 includes an arm head 2, a retainer 4 rotatably connected to the arm head 2 via a pivot shaft 3, and an arm piece 5 held by the retainer 4. I have. In the present embodiment, the retainer 4 and the arm piece 5 constitute an arm body.

  The arm head 2 includes a substantially cylindrical base end portion 2A and an arm portion 2B extending from the base end portion 2A to the front end side. A connecting hole 2C penetrating in the vertical direction is formed in the base end portion 2A. The wiper arm 1 is driven by the drive means by fitting a drive shaft (not shown) of the drive means into the connecting hole 2C. A pivot shaft hole 2E that penetrates the arm 2A in the left-right direction is formed at a predetermined position adjacent to the tip 2D of the arm 2A. Furthermore, the roller pin hole 2F is formed in the front-end | tip part 2D of the arm part 2A (refer FIG. 8).

  The retainer 4 is a member constituting a central portion in the longitudinal direction of the wiper arm 1 and includes a top surface 4A and side surfaces 4B on both sides extending downward from both side portions of the top surface 4A. An urging mechanism 10 is accommodated in a space surrounded by the top surface 4A and both side surfaces 4B of the retainer 4. The detailed configuration of the urging mechanism 10 will be described later.

  Pivot shaft holes 4D are formed in the base end portions 4C of the side surfaces 4B of the retainer 4, respectively. The pivot shaft 3 is mounted through the pivot shaft hole 4D of the retainer 4 and the pivot shaft hole 2E of the arm head 2. As a result, the retainer 4 is connected to the arm head 2 so as to be rotatable around the pivot shaft 3.

  Rivet holes 4E are formed at predetermined locations on the side surfaces 4B of the retainer 4, respectively. As will be described in detail later, the intermediate rivet 13 of the urging mechanism 10 is fixed to the rivet hole 4E.

  An arm piece 5 is attached to the distal end portion 4F of the retainer 4. The arm piece 5 is provided with a U hook portion 5A curved in a U-shape at the tip portion, and the wiper blade (not shown) is held in the hook portion 5A.

  With such a configuration, the wiper arm 1 is in a normal use state in which the arm body (the retainer 4 and the arm piece 5) extends substantially straight from the arm head 2 in the longitudinal direction by the rotation of the retainer 4 with respect to the arm head 2 ( The state shown in FIGS. 1 and 2) and the lockback state (state shown in FIGS. 3 and 4) in which the arm body stands up with respect to the arm head 2 can be selectively taken.

  5 to 8 show the urging mechanism 10 in detail. As illustrated, the biasing mechanism 10 includes a spring 11, a pair of fulcrum support members 12 disposed on both sides of the spring 11, an intermediate rivet 13 and a fulcrum rivet 14 that connect the pair of fulcrum support members 12, And a lever member 15 rotatably attached to the fulcrum rivet 14.

  The spring 11 is a tension coil spring, and both end portions thereof are curved in a U shape to form a distal end side hook portion 11A and a proximal end side hook portion 11B. The distal end hook portion 11A of the spring 11 is attached to the proximal end side connecting pin 13, and the proximal end hook portion 11B of the spring 11 is attached to a force application hole 15D of the lever member 15 described later. Yes.

  The hook 11 </ b> A on the front end side of the spring 11 is formed in a direction substantially orthogonal to the upper surface 4 </ b> A of the retainer 4. On the other hand, the base end side hook portion 11B is formed so as to be arranged substantially parallel to the upper surface 4A of the retainer 4. Thereby, since the proximal end side hook part 11B of the spring 11 can be attached to the lever member 15 sideways, as a result, the spring 11 is positioned at a position close to the upper surface 4A of the retainer 4 so that the upper surface 4A of the retainer 4 is closed. Can be arranged almost in parallel.

  The pair of fulcrum support members 12 are elongated plate members having substantially the same length as the spring 11, and are arranged on both sides of the spring 11 in parallel with the spring 11. A distal end side mounting hole 12C in which the intermediate rivet 13 is mounted is formed in the distal end portion 12A of the fulcrum support member 12. In addition, a base end side mounting hole 12D in which the fulcrum rivet 14 is mounted is formed in the base end portion 12B of the fulcrum support member 12.

  The intermediate rivet 13 is disposed so as to penetrate through the distal end side mounting holes 12C of the fulcrum support members 12 on both sides, and is fixed to the distal end side mounting holes 12C so that the distal end portions 12A of the fulcrum support members 12 on both sides are connected to each other. It is connected. Further, both end portions of the intermediate rivet 13 are fixed to rivet holes 4F on both side surfaces 4B of the retainer 4, respectively. Thereby, the urging mechanism 10 is fixed to the retainer 4 via the intermediate rivet 13.

  On the other hand, the fulcrum rivet 14 is disposed through the proximal end side mounting hole 12D of the fulcrum support member 13, and is fixed to the proximal end side mounting hole 12D. Accordingly, the base end portions 12B of the fulcrum support members 12 on both sides are connected to each other by the fulcrum rivets 14. With such a configuration, as will be described later, when the fulcrum rivet 14 becomes the fulcrum of the lever with the center of rotation of the lever member 15, the load acting on the fulcrum rivet 14 is reliably supported by the fulcrum support member 12. It has come to be.

  The lever member 15 is a cam that boosts and transmits the spring force of the spring 11 based on the principle of the lever, and includes a center portion 15A, a force point side arm portion 15B extending from the center portion 15A to both sides, and an action point arm. 15C. The length of the force point side arm portion 15B is longer than that of the action point side arm portion 15C at a predetermined ratio so as to obtain an increase in force based on the principle of leverage.

  A fulcrum hole 15D is formed in the central portion 15A of the lever member 15, and the fulcrum rivet 14 is inserted into the fulcrum hole 15D in an unfixed state. Thereby, the lever member 15 is attached to the fulcrum rivet 14 and can be rotated around the axis of the support rivet 14.

  On the other hand, a force point hole 15E is formed in the vicinity of the tip of the force point side arm portion 15B, and a base end side hook portion 11B of the spring 11 is attached to the force point hole 15E. An action point hole 15F is formed near the tip of the action point side arm portion 15C, and a roller pin 16 is rotatably inserted into the action point hole 15F. The roller pin 16 is attached to the roller pin hole 2F (see FIG. 8) of the arm head 2 so as to be rotatable. As a result, the lever member 15 is linked to the arm head 2 via the roller pin 16 so as to be rotatable.

  The lever member 15 functions as a lever that boosts and transmits the spring force of the spring 11. Specifically, the fulcrum hole 15D portion of the lever member 15 is a lever fulcrum, the force point hole 15E portion is a lever force point to which the force of the spring 11 is applied, and the action point hole 15F portion is a spring. Each of these functions as an action point at which 11 forces are boosted. That is, if the distance from the center of the fulcrum hole 15D to the center of the action point hole 15F is L1, and the distance from the center of the fulcrum hole 15D to the center of the force point hole 15E is L2 (see FIG. 5), the force point of the lever member 15 is The spring force of the added spring 11 is amplified by L2 / L1 and transmitted to the fulcrum hole 15F side of the lever member 15. At the same time, the direction of the spring force of the spring 11 is also converted by the lever member 15.

Next, the overall operation of the wiper arm 1 will be described.
In the normal use state as shown in FIGS. 1, 2, and 5, the urging mechanism 10 acts to urge the arm main body in the counterclockwise rotation direction of the figure with respect to the arm head 2. More specifically, the spring force to be contracted by the spring 11 of the urging mechanism 10 acts to rotate the lever member 15 of the urging mechanism 10 around the fulcrum rivet 14 in the clockwise rotation direction in the figure. To do. Thus, the action point side arm portion 15C of the lever member 15 pushes the arm head 2 toward the proximal end side in the longitudinal direction of the wiper arm 1, and as a result, the arm main body (the retainer 4 and the arm piece 5) It receives a force in the counterclockwise direction of rotation in the figure. Therefore, the wiper blade (not shown) held at the tip of the arm piece 5 is pressed against the surface to be wiped (not shown) with an appropriate pressing force applied from the urging mechanism 10. .

  In this case, the spring force of the spring 11 is amplified by L2 / L1 times by the action of the lever member 15 based on the lever principle. Here, L1 is the length from the fulcrum hole 15D to the action point hole 15F in the lever member 15, and L2 is the length from the fulcrum hole 15D to the force point hole 15E (see FIG. 5). Therefore, even if the spring 11 having a small size (small diameter) and a small spring force is used, a sufficient pressing load can be obtained.

  On the other hand, in the lockback state as shown in FIGS. 2, 3, and 6, the urging mechanism 10 functions to hold the arm main body in an upright state with respect to the arm piece 2. More specifically, when the spring force to be contracted by the spring 11 acts to rotate the lever member 15 in the clockwise rotation direction in the figure, the action point side arm portion 15 </ b> C of the lever member causes the tip of the arm head 2 to move. As a result, the spring force of the spring 11 applies the arm body (retainer 4) to the arm head 2 in the clockwise rotation direction in the figure. It will be. Therefore, the arm main body is held in an upright state by the spring force of the spring 11, and the lockback state of the wiper arm 1 is maintained. Also in this case, the spring force of the spring 11 is amplified by L2 / L1 times due to the action of the lever member 15, so that a sufficient holding force can be obtained even with the small spring 11.

  As described above, according to the wiper arm 1 of the present embodiment, the spring force of the spring 11 is acted by being boosted by the lever member 15, so that a sufficient pressing force can be obtained even with a small spring. Therefore, the spring 11 can be downsized (smaller diameter), and the wiper arm 1 can be downsized (thinned) by reducing the storage space of the spring 11.

  Further, by forming the proximal end side hook portion 11B of the spring 11 so as to be arranged in a direction parallel to the upper surface 4A of the retainer 4, the proximal end side hook portion 11B of the spring 11 can be moved with respect to the lever member 15. As a result, the spring 11 can be disposed substantially parallel to the upper surface 4A of the retainer 4 at a position close to the upper surface 4A of the retainer 4. Therefore, the wiper arm 1 can be further reduced in thickness.

  Further, since the spring 11 is linked to the wiper arm 2 via the lever member 15, a hook member (refer to the hook member 107 in FIG. 10) such as a conventional wiper arm is also unnecessary. Therefore, the urging mechanism 10 can be completely stored in the space surrounded by the upper surface 4A and the both side surfaces 4B of the thin retainer 4, and the member protruding from the lower side of the retainer 1 can be eliminated. Can be made thinner and more beautiful.

  Further, the force applied from the urging mechanism 10 includes the spring force of the spring 11, the shape of the lever member 15 (the length L1 of the fulcrum hole 15D to the force application hole 15E and the length L2 from the fulcrum hole 15D to the action point hole 15F), Since it can be calculated from the length of the fulcrum support member 12, the attachment position of the intermediate rivet 13 and the roller pin 16, etc., the pressing force can be managed precisely.

  Further, since the urging mechanism 10 is configured as one unit and has a solid structure, the fulcrum of the lever member 15 is securely supported by the fulcrum support member 12, and an appropriate boosting force by the lever member 15 and The transmission of power can be secured. Moreover, since the urging mechanism 10 as a unit can be easily attached to the retainer 4 and the arm head 2, the assembly work of the wiper arm 1 can be facilitated.

  Further, since the shape of the lever member 15 in the urging mechanism 10 has a degree of freedom of change, the shape of the lever member 15 is adjusted so that the moment of force acting on the retainer 4 from the lever member 15 is maximized. be able to. That is, as shown in FIG. 5, the action point hole 15F (roller pin 16) is applied to a line segment (moment arm L3) from the center of the pivot shaft hole 2E (pivot shaft 3) to the center of the action point hole 15F (roller pin 16). The moment of the force exerted from the lever member 15 can be maximized by adjusting the shape of the lever member 15 so that the direction of the urging force W acting on the lever) is orthogonal. Therefore, the force from the urging mechanism 10 can be efficiently used as the pressing force.

FIG. 9 shows a wiper arm 6 according to a second embodiment of the present invention.
As shown in the drawing, the wiper arm 6 of the present embodiment differs from the wiper arm 1 of the first embodiment only in that an urging mechanism 20 is provided instead of the urging mechanism 10. Is. Therefore, members common to the wiper arm 1 are denoted by the same reference numerals and description thereof is omitted.

  As illustrated, the urging mechanism 20 differs from the urging mechanism 10 in that the lever member 25 is disposed on the distal end side of the spring 21, that is, on the side opposite to the arm head 2. More specifically, the urging mechanism 20 includes a spring 21 that is a tension coil spring and fulcrum support members 22 disposed on both sides of the spring 21. A fulcrum rivet 23 is connected to the distal end 22A side of the fulcrum support member 22, and a proximal rivet 24 is connected to the proximal end 22B side.

  The proximal end rivet 24 is fixed to the distal end portion 2E of the arm head 2. A holding member 27 to which the base end portion 21B of the spring 21 is attached is attached to the base end rivet 24 so as to be rotatable.

  A lever member 25 is rotatably attached to the fulcrum rivet 23. The lever member 25 includes a center portion 25A, and a force point side arm portion 25B and an action point side arm portion 25C extending on both sides of the center portion. The fulcrum rivet 23 is inserted into a fulcrum hole 25D formed in the central portion 25A, whereby the lever member 25 is rotatably attached to the fulcrum rivet 23.

  A tip side hook portion 21 </ b> A of the spring 21 is attached to the power point hole 25 </ b> E of the lever member 25. On the other hand, the roller pin 26 is rotatably mounted in the action point hole 25F of the lever member 25. The roller pins 26 are attached to both side surfaces 4B of the retainer 4.

  Thus, also by the configuration in which the lever member 25 is disposed on the side opposite to the arm head 2, the spring force of the spring 21 is boosted and transmitted by the lever member 25 at a rate according to the principle of the lever. Therefore, the wiper arm 6 of the present embodiment can provide the same operational effects as the wiper arm 1 of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Wiper arm 2 Arm head 3 Pivot shaft 4 Retainer 4A Retainer upper surface 4A Retainer side surface 4C Pivot shaft hole 4D Rivet hole 5 Arm piece 6 Wiper arm 10 Energizing mechanism 11 Spring 12 Support point support member 13 Intermediate rivet 14 Support point rivet 15 Insulator Member 15A lever member central portion 15B lever member force point side arm portion 15C lever member action point side arm portion 15D lever member fulcrum hole 15E lever member force point hole 15F lever member action point hole 16 roller pin 20 biasing mechanism 21 Spring 22 Support point support member 23 Support point rivet 24 Base end side rivet 25 Insulation member 25A Insulation member center portion 25B Insulation member force point side arm portion 25C Insulation member action point side arm portion 25D Insulation member support point hole 25E Insulation member force Point hole 25F Point member action point hole 26 Roller Pin 27 holding member

Claims (6)

In a wiper arm comprising: an arm head; an arm body connected to the arm head so as to be rotatable around a pivot axis; and a biasing means provided between the arm head and the arm body.
The biasing means includes a spring, a fulcrum support member arranged in parallel with the spring, and a lever member having a fulcrum, a force point, and an action point.
A first end of the fulcrum support member is linked to the first end of the spring and linked to one of the arm head and the arm body;
The fulcrum of the lever member is linked to the second end of the fulcrum support member,
The point of action of the lever member is linked to the other of the arm head and the arm body,
The force point of the lever member is a wiper arm linked to the second end of the spring.   The wiper arm according to claim 1, wherein the biasing means includes a pair of fulcrum support members disposed on both sides of the spring.   A first connecting member that connects the first ends of the pair of fulcrum support members; and a second connecting member that connects the second ends of the pair of fulcrum support members; Is attached to one of the arm head and the arm body, the first end of the spring is attached to the first connecting member, and the lever member is attached to the second connecting member. The wiper arm according to claim 2, wherein the wiper arm is rotatably attached around the fulcrum.   The wiper arm according to claim 3, wherein the first and second connecting members are rivets.   The wiper arm according to any one of claims 1 to 4, further comprising a roller pin that links an operating point of the lever member with the other of the arm head and the arm main body.   The second end portion of the spring is a hook portion that is attached to the force point of the lever member, and the hook portion is formed so as to be disposed substantially parallel to the upper surface of the arm body. The wiper arm according to any one of claims 1 to 5.

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